Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Assets and Liabilities Measured on a Nonrecurring Basis (Details)

v2.4.0.8
Fair Value Measurements - Assets and Liabilities Measured on a Nonrecurring Basis (Details) (Level 3, USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Fair Value Inputs [Abstract]    
Discount rate 8.00% 8.00%
Fair Value, Measurements, Nonrecurring
    
Equity, Fair Value Disclosure [Abstract]    
Issuance of preferred stock to One Stone $ 23,502  
Combination of discounted cash flow model and market value approach | Fair Value, Measurements, Nonrecurring
    
Fair Value Inputs [Abstract]    
Adjusted oil price 95  
Discount rate 10.00%  
Discounted cash flow model | Minimum | Fair Value, Measurements, Nonrecurring
    
Fair Value Inputs [Abstract]    
Discount rate 10.00%  
Contract period 17 years  
Discounted cash flow model | Maximum | Fair Value, Measurements, Nonrecurring
    
Fair Value Inputs [Abstract]    
Discount rate 11.50%  
Contract period 19 years  
Market value approach | Fair Value, Measurements, Nonrecurring
    
Fair Value Inputs [Abstract]    
Issuance price $ 1.22149381  
Nautilus Purchase and Sale Agreement (PSA) | Fair Value, Measurements, Nonrecurring
    
Assets, Fair Value Disclosure [Abstract]    
Acquisition of oil and gas properties under the Nautilus PSA 2,141  
Santos Sales Agreement | Fair Value, Measurements, Nonrecurring
    
Assets, Fair Value Disclosure [Abstract]    
Acquisition of oil and gas properties under the Nautilus PSA $ 3,403